diff --git a/sensu-plugins-elasticsearch.gemspec b/sensu-plugins-elasticsearch.gemspec
index 37fc660..5f9e0a9 100644
--- a/sensu-plugins-elasticsearch.gemspec
+++ b/sensu-plugins-elasticsearch.gemspec
@@ -40,7 +40,7 @@ Gem::Specification.new do |s| # rubocop:disable Metrics/BlockLength
 
   s.add_development_dependency 'bundler',                   '~> 2.1'
   s.add_development_dependency 'codeclimate-test-reporter', '~> 0.4'
-  s.add_development_dependency 'github-markup',             '~> 1.3'
+  s.add_development_dependency 'github-markup',             '~> 4.0'
   s.add_development_dependency 'kitchen-docker',            '~> 2.6'
   # locked to keep ruby 2.1 support, this is pulled in by test-kitchen
   s.add_development_dependency 'mixlib-shellout',           ['< 2.3.0', '~> 2.2']